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DC1741A

Description
board eval for ltc4370
CategoryDevelopment board/suite/development tools   
File Size136KB,6 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance  
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DC1741A Overview

board eval for ltc4370

DEMO MANUAL DC1741A
LTC4370
Two-Supply Diode-OR
Current Balancing Controller
DESCRIPTION
Demonstration circuit DC1741A features the LTC4370, a
two supply diode-OR current sharing controller in a typical
2.9V to 18V, 16A sharing application.
The maximum MOSFET voltage drop V
FR
= V
IN
– OUT is
set with an external resistor, up to 600mV. A fast gate
turn-on reduces the load voltage droop during supply
switchover. If the input supply fails or is shorted, a fast
turn-off minimizes the transient reverse current.
Disabling the load sharing function turns the LTC4370
into a dual ideal diode controller.
Two enable input pins,
EN1
and
EN2,
allow enabling and
disabling each rail’s MOSFET individually while the MOS-
FETs’ inherent diodes create diode-OR connection when
the MOSFETs are disabled. The LTC4370 provides a rich
set of features to support shared current diode-ORed ap-
plications including:
• Load Sharing Between Two Supplies
• Elimination of the Need for Active Control of Input
Supplies
• Elimination of "Share Bus”
• Reverse Current Blocking
• Elimination of Shoot-Through Current During Start-Up
or Faults
Design files for this circuit board are available at
http://www.linear.com/demo
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
SYMBOL
V
IN
V
CC(EXT)
V
CC(REG)
V
EA(OS)
g
m(EA)
V
FR
ΔV
GATE
I
GATE
PARAMETER
V
IN1
and V
IN2
Input Voltage Operating Range
Specifications are at T
A
= 25°C
MIN
2.9
0
2.9
4.5
5
0
150
TYP
MAX
18
V
CC
6.0
5.5
±2
25
50
14
9
–1.9
1.9
160
620
1.1
16.6
UNITS
V
V
V
mV
μS
mV
mV
V
V
A
A
μA
mV
V
A
CONDITIONS
With External V
CC
Supply
V
CC
External Supply Operating Range
V
CC
Regulated Voltage
Error Amplifier Input Offset
Error Amplifier Gain
Forward Regulation Voltage (V
IN
– V
OUT
)
MOSFET Gate Drive (GATE-V
IN
)
GATE1, GATE2 Fast Pull-Up Current
GATE1, GATE2 Fast Down-Up Current
GATE1, GATE2 Off Pull-Down Current
EN1, EN2
Threshold Voltage
Maximum Continuous Load Current
V
IN1
, V
IN2
≤ V
CC
V
IN
=1.2V, V
CC
= 5V
V
IN
=12V
V
FWD
= 0.2V; I = 0, –1μA; Highest V
IN
= 12V
V
FWD
= 0.2V; I = 0, –1μA; Highest V
IN
= 2.9V
V
FWD
= 0.4V, ΔV
GATE
= 0V, CPO = 17V
V
FWD
= –2V, ΔV
GATE
= 5V,
Corresponding
EN
=1V, ΔV
GATE
= 2.5V
EN
Falling
FETON Transitions High
Sharing active, limited by SUM85N03 FET Dissipation
2
2
10
4.5
–0.9
0.9
65
580
0.28
12
25
12
7
–1.4
1.4
110
600
0.7
V
EN(TH)
I
OUT
ΔV
GATE(ON)
MOSFET On-Detect Threshold (GATE-V
IN
)
dc1741af
1

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